This is a complete lesson plan on using the exponential function to solve word problems involving exponential decay and half-lives.
This lesson includes an opening activity, minilesson with guided steps through the process, examples, class activities and a worksheet for homework. Answer keys included.
Common Core standards included on cover page for High School Algebra and Functions.
I also have lessons on graphing exponential functions as well as exponential growth posted in my TpT store.
Both pdf and Word versions are included in the zip folder.